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function declination(a, b, c, s) {
  var words = [a, b, c];
  var index = s % 100;
  if (index >=11 && index <= 14) { index = 0; }
  else { index = (index %= 10) < 5 ? (index > 2 ? 2 : index): 0; }
  return(words[index]);
}